In recent years, uav aerial photography has gradually entered the public's field of vision. Its unconventional shooting perspective, convenient operation and simple structure have won the hearts of numerous image creation institutions and even entered ordinary people's homes.
At present, the mainstream aerial uav is multi-rotor aircraft, straight aircraft and fixed wing. Their structure determines that the fixed wing can fly for a long time, but the fixed wing has high requirements for takeoff and landing, and cannot hover during flight, etc., which can only be used in surveying and mapping and other industries with low requirements for image quality. While the multi-rotor aircraft, straight aircraft although the flight time is short, but can take off and land in complex type, smooth flight, can hover, wind resistance is good, easy to operate, is currently in the image creation of the most used models. These two models use batteries as the main power source, and the straight plane can also be powered by an oil-powered engine, but the mechanical vibration and greater flight risk caused by oil greatly reduce their utilization rate. As a result, the use of batteries is more and more popular in unmanned aerial photography. A team is equipped with a variety of batteries as few as a dozen or as many as dozens of batteries, which tirelessly provide power guarantee for various electrical components of the aircraft, such as motor, electric modulation, flight control, OSD, picture transmission, receiver, remote control, monitor and so on. In order to better and safer flight, it is necessary to understand the parameters, use, maintenance, charge and discharge of batteries, so as to ensure the smooth progress of each aerial photography task. Let's learn about the batteries silently dedicated in aerial photography.
The full name of the lithium batteries used in aerial photography is "Li-polymer batteries" (li-polymer batteries), commonly referred to as lithium batteries. Lithium polymer battery is a new type of battery with many obvious advantages, such as high energy density, miniaturization, ultra-thin, lightweight, high safety and low cost. In shape, lithium polymer battery has the characteristics of ultra-thin, can meet the needs of a variety of products, made into any shape and capacity of the battery, the outer packaging is aluminum plastic packaging, different from the metal shell of liquid lithium, internal quality risks can be immediately through the outer packaging deformation and show, such as bulging.
The following from the basic parameters of the battery began to understand, with a 22.2V 10000mAh aerial power battery as an example, it is made up of six rated voltage of 3.7V, capacity 10000mAh lithium cell series, that is, often said 6S1P. There are also 6S2P batteries, which are composed of 12 5000mAh batteries in parallel and series. It should be noted that 6S1P is more secure than 6S2P, because 1P is twice as simple as 2P, and of course the price of 1P is also higher.
The single cell voltage of 3.7V is the rated voltage, which is obtained from the average operating voltage. The actual voltage of single chip lithium cell is 2.75~ 4.2V, and the capacity of lithium cell is the amount of electricity obtained from 4.2V discharge to 2.75 V. Lithium batteries must be kept within the voltage range of 2.75 V to 4.2V. If the voltage is lower than 2.75V belongs to excessive discharge, lithium will expand, the internal chemical liquid will crystallize, these crystals may Pierce the internal structural layer cause a short circuit, and even make the lithium voltage become zero. When charging, the single chip voltage is higher than 4.2V, which belongs to overcharging. The internal chemical reaction is too intense, and the lithium will inflate and expand. If the charging continues, it will expand and burn. Therefore, we must use a regular charger that meets safety standards to charge the battery, and it is forbidden to modify the charger privately, which may cause very serious consequences!
